OK, my bad
it is Carrier, model: 50SD, sigle-package Electrical Cooling/Heating Units.
It has 2 separate unites; AC unit and Heating unit with separate control leads. 1st control lead includes: Brown for common, Red for power, Yellow for cooling and Green for fan blower. 2nd control leads includes: Brown for common, White for stage one heating and violet for stage 2 heating.
I connected the Browns together( Brown wire in cooling control with Brown wire in heating control, then I connected Red wire in Unite to R terminal in T-stat, Green wire in unite to G terminal in T-stat, Yellow wire in unit to Y terminal In T-state, White wire in unite to W1 in
T-stat and Violet wire in unit to W2 in T-stat.
The problem I have; if the T-stat in Auto and run the heat, the Blower will NOT run but if I change the Blower to on it will work just fine.
I do not get to same problem if I run cooling even the blower in Auto position, every thing run fine.
I checked all connections, I changed the T-stat to new and deferent T-stat; I still get the same problem. Please if you can help please do so. Sparky